Conventional accessories

Liquid level indicators

Liquids like mineral and silicone oils insulate and cool a transformer. You need to monitor the level of the oil to assure reliable and safe operation of the transformer. Choose our liquid level indicators and control any unexpected or accidental oil leakages that may lead to a transformer failure. Our accessories fit all transformer designs. Personalize the value settings for alarms and switches to fit your specific needs. The operator can monitor the preset values on-site through the easy-to-read dial and decide on the best transformer maintenance schedule.
Contact us and get support with the product selection.

Why buy

  • Proven technology
  • Customizable mounting flange suitable for all transformer designs
  • Adjustable value settings for alarms and switches
  • Large installed base
  • Easy installation
  • Easy-to-read dials


  • Liquid-filled transformers with or without conservator
  • Conservator with rubber bag
  • Suitable for new installations and retrofits
  • Suitable for offshore environment
  • Suitable for tropical climates

Technical data at a glance

Standard IEC 600076-22-1
HousingAlluminum alloy
Types of installation environmentIndoorCorrosion class: C4-MediumRAL 7032
OutdoorCorrosion class: C4-MediumRAL 7032
Coastal areaCorrosion class: C5-MediumGeomet coating
Off ShoreCorrosion class: CXRAL 7035
LensPolycarbonate or tempered glass
FlangeAlluminum alloy
Flange designL140OLI22, L220OLIL340
“In-house design,
6 holes”
“In-house design,
8 holes”
“Compatible with
all transformer designs,
4 holes”
“In-house design,
8 holes”
Dial“Numbers and letters directly screen-printed on alluminum plate
Customizable range (MIN +20°C, MAX, other available)”
Adjustable switchesYes
Ventilation valveYes
Float elementRohacell
Float movementRadial, axial, axial for rubber bag
Liquid temperaturefom -40°C to +120°C
Ambient temperaturefrom -40°C to +80°C
Cable gland1; M25x1.5
3; M25x1.5 for OLI; OLI22, eOLI, and eOLI22
Degree of protectionIP65 (L140; L220; L340)
IP66 (OLI and OLI22)
Power supply24 – 230 V ac/dc
Vibration class4M4

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